1. The Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts 02115, USA
2. Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA
3. Center for Research in Health Technologies and Information Systems (CINTESIS), Porto, Portugal and Instituto de Telecomunicações, Porto, Portugal
4. Joslin Diabetes Center, Boston, Massachusetts 02215, USA
5. MCPHS University, Boston, Massachusetts 02215, USA